That's all fine and nice dazrin but where do you get the information from. I find very little page counts with the electronic books I tend to buy.

I don't remember where I posted this last, but this is how I find page numbers:

Amazon and other retailers typically list them if they have a paper version of the book. Again, if there is a MMPB version I use it. I rarely need to use other retailers.

Goodreads has many page counts for different versions of books. I just look for the MMPB versions or another PB version if none is listed as a MMPB.

Amazon sometimes lists “approximate page counts” even if there is no paper version of a book.

If you use Calibre there is a page count plugin that will provide an approximate page count. I rarely use this one since I don't normally use Calibre. Generally only for books from sources other than Amazon since I don't ever bring Amazon books into Calibre.

When I can't find any page count in the locations above I have kept records of the average number of pages/location in Kindle books and use this to back-calculate an approximate page count. Right now my average is 15.84 locations/page since January 2011 and 160ish books.

I have been accused of being too detailed in this. They were probably right.

I also have considered using a "locations" goal since that is a number that I can easily find and is well defined (128 bits). That would cover anything I put on my Kindle, but doesn't intuitively tell me how long a book is, so I prefer pages.